NEWAYGO COUNTY, MI -- Wanda Lankey-Foster was a year younger than her sister, Amanda, when the older teen went missing in June 2004.

Ever since then, she keeps a running tally in her head of the days that have passed since her sister disappeared.

"Eight years, two months and two days," the 19-year-old said in a matter-of-fact manner.

In a way, the clock she keeps is a countdown to justice for her sister.

Amanda Lankey's body was found by mushroom hunters in the Manistee National Forest about two weeks after she went missing from a friend's house. She died from blunt force trauma to her head, possibly from a bat or pipe.

"I really hope that right now, we finally have some kind of proof that people have lied," she said.

Amanda Lankey, 13, was killed in 2004

Police on Wednesday arrested Candace Baumgartner-Wallis -- whose brother killed himself in 2011 after he was accused of sexually assaulting two teens a decade ago and he also named a person of interest in the Lankey slaying.

Baumgartner-Wallis was a part-time White Cloud police officer and had served on the town's City Council.

Prosecutors accuse her of making false statements while giving testimony for an investigative subpoena looking at the Lankey homicide.

Wanda Lankey-Foster said she she can only speculate about Baumgartner-Wallis' involvement in the case, but wonders whether she covered up information.

Lankey-Foster, whose family moved to Florida years ago, moved back to White Cloud this summer.

People around the small community knew who she was, and that Amanda was her sister.

"Sometimes people look at me and just whisper," she said.

Lankey-Foster said she was excited and "'speechless" to hear about the arrest Wednesday. She said it may be the family's only avenue for a semblance of justice in her sister's death.

"I'm pretty sure the police are trying to do what they can for us," she said.

Baumgartner-Wallis is to be arraigned on the perjury charge in a week.